* Rename waku_api to rest_api and underlying rest to endpoint for clearity
* Rename node/api to node/kernel_api to suggest that it is an internal accessor to node interface + make everything compile after renaming
* make waku api a top level import
* fix use of relative path imports and use default to root rather in case of waku and tools modules
* Upgrade lpt to new config methods
* Make choice of legacy and v3 lightpush configurable on cli
* Adjust runner script to allow easy lightpush version selection
* Prepare selectable lightpush for infra env runs
* Fix misused result vs return
* Fixes and more explanatory comments added
* Fix ~pure virtual~ notice to =discard